Telnet

From Wikipedia:
"Telnet (Telecommunication network) is a network protocol used on the Internet or local area network (LAN) connections. It was developed in 1969 beginning with RFC 15 and standardized as IETF STD 8, one of the first Internet standards. Typically, telnet provides access to a command-line interface on a remote machine.The term telnet also refers to software which implements the client part of the protocol."

If so you just have to launch inetd daemon at the start of your system. You can for example add the following script on your APF as /etc/init.d/S60inetd (for convenience, a copy of this script can be found in target/scripts/) :